Analysis of niche characteristics of phytoplankton functional groups in fluvial ecosystems

Author:

Nagy-László Zsolt12,Padisák Judit2,Borics Gábor13,Abonyi András45ORCID,B-Béres Viktória13,Várbíró Gábor13

Affiliation:

1. MTA CENTRE FOR ECOLOGICAL RESEARCH, DANUBE RESEARCH INSTITUTE, DEPARTMENT OF TISZA RIVER RESEARCH, 18/C BEM SQR., H-4026 DEBRECEN, Hungary

2. UNIVERSITY OF PANNONIA, DEPARTMENT OF LIMNOLOGY, 10. EGYETEM STR., H-8200 VESZPRéM, Hungary

3. MTA CENTRE FOR ECOLOGICAL RESEARCH, HUNGARIAN ACADEMY OF SCIENCES, GINOP SUSTAINABLE ECOSYSTEMS GROUP, 3. KLEBENSBERG KUNO STR., H-8237 TIHANY, Hungary

4. MTA CENTRE FOR ECOLOGICAL RESEARCH, INSTITUTE OF ECOLOGY AND BOTANY, 2-4. ALKOTMáNY STR., H-2163 VáCRáTóT, Hungary

5. WASSERCLUSTER LUNZ, BIOLOGISCHE STATION GMBH, 5. DR. CARL KUPELWIESER PROMENADE, A-3293 LUNZ AM SEE, Austria

Abstract

Abstract Assigning species to functional response groups in phytoplankton ecology reduces the number of functional units, which helps understand the processes that shape diversity and functioning of planktonic assemblages. Although the concept has become widespread in recent years, numerical characterization of the groups’ positions in the niche space remained a challenging task. Using a large river phytoplankton dataset, we characterized the functional groups (FGs) of phytoplankton by their niche position and niche breadth in the niche space defined by the relevant environmental variables using the Outlying Main Index approach. The niche space has been defined primarily by trophic-related (nutrients) and river size-related variables (water residence time, discharge). Although we hypothesized that FGs with central niche position would have wide, while those with marginal niche position have narrow niche breadth, these have not been corroborated by the results. Rather, FGs occurred both with central niche position and intermediate breadth, as well as with marginal niche position and wide breadth. Niche position of several FGs was different from that suggested by their known habitat templates in lakes. Furthermore, we found no significant relationship between niche position and niche breadth, suggesting that the occurrence of FGs in rivers is simultaneously influenced by both niche characteristics.

Funder

National Research, Development and Innovation Office

Publisher

Oxford University Press (OUP)

Subject

Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics

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